How to get the exchange rate between ust and aust on smart contract

jameszook · January 6, 2022, 5:17pm

I am senior blockchain developer.
I am developing the invest platform on terra chain.
I want to deposit the all backed money to anchor protocol to earn.
How to get the exchange rate between Ust and aUst on smart contract.
or using terra.js.
Thanks.
James

saad.najafi · January 10, 2022, 8:59pm

To get the exchange rate of UST and aUst on a smart contract you should use a smart query from cosmwasm by sending this query to the market contract

github.com

Anchor-Protocol/money-market-contracts/blob/c85c0b8e4f7fd192504f15d7741e19da6a850f71/packages/moneymarket/src/market.rs#L108

    
      
              RedeemStable {},
          }
          
          
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
          #[serde(rename_all = "snake_case")]
          pub enum QueryMsg {
              Config {},
              State {
                  block_height: Option<u64>,
              },
              EpochState {
                  block_height: Option<u64>,
                  distributed_interest: Option<Uint256>,
              },
              BorrowerInfo {
                  borrower: String,
                  block_height: Option<u64>,
              },
              BorrowerInfos {
                  start_after: Option<String>,
                  limit: Option<u32>,

and the response is going to be this

github.com

Anchor-Protocol/money-market-contracts/blob/c85c0b8e4f7fd192504f15d7741e19da6a850f71/packages/moneymarket/src/market.rs#L152

    
      
              pub last_reward_updated: u64,
              pub global_interest_index: Decimal256,
              pub global_reward_index: Decimal256,
              pub anc_emission_rate: Decimal256,
              pub prev_aterra_supply: Uint256,
              pub prev_exchange_rate: Decimal256,
          }
          
          
// We define a custom struct for each query response
          #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
          pub struct EpochStateResponse {
              pub exchange_rate: Decimal256,
              pub aterra_supply: Uint256,
          }
          
          
// We define a custom struct for each query response
          #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
          pub struct BorrowerInfoResponse {
              pub borrower: String,
              pub interest_index: Decimal256,
              pub reward_index: Decimal256,

using terra.js you need to send epoch_state query using terra.js like following

lcd.wasm.contractQuery($MARKET_ADDRESS, {epoch_state:{}})

here is an API to call as well:
https://lcd.terra.dev/wasm/contracts/terra1sepfj7s0aeg5967uxnfk4thzlerrsktkpelm5s/store?query_msg={"epoch_state":{}}

jameszook · February 8, 2022, 2:24am

Thanks a lot.
Regards

jameszook · February 8, 2022, 2:25am

one more question.
Can I do to yield from Anchor by depositing?

coin_seeker · February 8, 2022, 11:44am

are you real dev? just check github manually. find the anchor SDK

jameszook · February 8, 2022, 12:13pm

Thanks
I already developed on smart contract to deposit to Anchor.
And I got the aUST from Anchor.
But someone told me that he received the some UST everyday from Anchor by depositing .
Is it right?
Please let me know.

jameszook · February 8, 2022, 12:14pm

You can check my work with rust cosmwasm.

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How to get the exchange rate between ust and aust on smart contract

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